Accession Number : AD0616102

Title :   UPSTREAM FLUCTUATIONS IN FLOW IN A FORWARD STAGNATION REGION,

Corporate Author : BROWN UNIV PROVIDENCE R I

Personal Author(s) : Hanson,Floyd B. ; Richardson,Peter D.

Report Date : APR 1965

Pagination or Media Count : 17

Abstract : Hot wire measurements of mean velocity and turbulent velocities were made on an upstream centerline from a 2.5 in. diameter horizontal cylinder. At .3 diameters from the stagnation point the mean velocity showed a sudden 'kink' deviation from theory prediction. It took about 3 diameters for recovery to the theoretical value. The 'kink' region also had peak turbulence intensity about double the expected value. The high energies in this region occurred at relatively long periods 50 to 60 m sec. Within the stagnation boundary layer the periods were 100 to 150 m sec. The 'kink' region showed only very short bursts of Strouhal frequency so that a tie-up of this phenomena to wake characteristics is rather doubtful. The need for further measurements including simultaneous hot wire systems is clear. (Author)

Descriptors :   (*STAGNATION POINT, TURBULENCE), (*CYLINDRICAL BODIES, FLUID DYNAMICS), VELOCITY, VORTICES, WAKE, BOUNDARY LAYER, REYNOLDS NUMBER, EXPERIMENTAL DATA, ANEMOMETERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE